/* Yılmazlar v1.2.0 — yayın, bilgi merkezi ve form erişilebilirliği */
.rb-form-error-summary,
.rb-field-error {
  display: block;
  color: #a32020;
  font-weight: 700;
}
.rb-form-error-summary {
  grid-column: 1 / -1;
  margin: 0 0 18px;
  padding: 13px 15px;
  border-left: 3px solid #e44343;
  background: #fff1f1;
}
.rb-field-error { margin-top: 7px; font-size: 12px; }
.site-form [aria-invalid="true"] {
  border-color: #c53030 !important;
  box-shadow: 0 0 0 3px rgba(197,48,48,.11);
}

.rb-knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 28px;
}
.rb-knowledge-card {
  overflow: hidden;
  background: #fff;
  border: 1px solid #dfe7ee;
  box-shadow: 0 18px 45px rgba(5,25,46,.08);
}
.rb-knowledge-card__media { display: block; aspect-ratio: 9/5.6; overflow: hidden; }
.rb-knowledge-card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform .45s ease; }
.rb-knowledge-card:hover .rb-knowledge-card__media img { transform: scale(1.035); }
.rb-knowledge-card__body { padding: 25px; }
.rb-knowledge-card__body > small { color: #f36f21; font-weight: 800; letter-spacing: .08em; }
.rb-knowledge-card h3 { margin: 10px 0; font-size: clamp(21px,2vw,27px); line-height: 1.2; }
.rb-knowledge-card h3 a { color: #071e42; }
.rb-knowledge-card p { color: #5a6878; line-height: 1.7; }

.rb-article-hero { padding: 145px 0 70px; background: #071a2e; color: #fff; }
.rb-article-hero__inner { display: grid; grid-template-columns: minmax(0,1.05fr) minmax(360px,.95fr); align-items: center; gap: 58px; }
.rb-article-hero h1 { margin: 14px 0 18px; font-size: clamp(42px,5.2vw,78px); line-height: .98; }
.rb-article-hero p { color: #b8c5d2; font-size: 18px; line-height: 1.7; }
.rb-article-hero img { width: 100%; aspect-ratio: 3/2; object-fit: cover; border: 1px solid rgba(255,255,255,.16); }
.rb-article-layout { display: grid; grid-template-columns: minmax(0,1fr) 330px; align-items: start; gap: 65px; }
.rb-prose { color: #28394b; font-size: 17px; line-height: 1.85; }
.rb-prose h2 { margin: 38px 0 14px; color: #071e42; font-size: clamp(27px,3vw,38px); line-height: 1.15; }
.rb-prose h3 { margin: 30px 0 12px; color: #071e42; }
.rb-prose p, .rb-prose ul, .rb-prose ol { margin: 0 0 20px; }
.rb-prose li { margin: 7px 0; }
.rb-article-aside { position: sticky; top: 110px; padding: 30px; background: #f2f5f8; border-top: 4px solid #f36f21; }
.rb-article-aside h2 { margin: 11px 0; color: #071e42; }
.rb-article-aside p { color: #5b6978; line-height: 1.65; }
.rb-article-aside .rb-btn { width: 100%; justify-content: center; margin-top: 10px; }
.rb-project-meta { display: flex; flex-wrap: wrap; gap: 12px 22px; margin-top: 24px; }
.rb-project-meta span { display: inline-flex; align-items: center; gap: 8px; color: #d8e1ea; font-weight: 700; }
.rb-project-gallery { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 15px; margin-top: 34px; }
.rb-project-gallery img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.rb-photo-credit { font-size: 13px; color: #718093; }

@media (max-width: 980px) {
  .rb-knowledge-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .rb-article-hero { padding-top: 120px; }
  .rb-article-hero__inner, .rb-article-layout { grid-template-columns: 1fr; }
  .rb-article-aside { position: static; }
}
@media (max-width: 640px) {
  .rb-knowledge-grid { grid-template-columns: 1fr; }
  .rb-article-hero { padding: 105px 0 46px; }
  .rb-article-hero__inner { gap: 28px; }
  .rb-article-hero h1 { font-size: clamp(36px,12vw,56px); }
  .rb-project-gallery { grid-template-columns: 1fr; }
}